The effect of pH on the bonding of Cu 2+  and chitosan-montmorillonite composite

Hu, Chao; Li, Guoyuan; Wang, Yiyu; Li, Fengyi; Guo, Guangguang; Hu, Hongqing

doi:10.1016/j.ijbiomac.2017.05.065

Cited by 12 publications

(5 citation statements)

References 27 publications

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“…The SV of amide I and N–H was determined at 1637 and 1549 cm −1 , respectively [ 10 ]. The peaks at 1404 and 1379 cm −1 also corresponded to the C–H in –CH 3 and –CH 2 groups, respectively [ 32 , 33 ]. The sharp peak at 1024 cm −1 was also responsible for the SV of the C–O in C–O–C group [ 10 ].…”

Section: Resultsmentioning

confidence: 99%

Development of Burdock Root Inulin/Chitosan Blend Films Containing Oregano and Thyme Essential Oils

Cao

Yang

Song

2018

IJMS

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In this study, inulin (INU) extracted from burdock root was utilized as a new film base material and combined with chitosan (CHI) to prepare composite films. Oregano and thyme essential oils (OT) were incorporated into the INU-CHI film to confer the films with bioactivities. The physical and optical properties as well as antioxidant and antimicrobial activities of the films were evaluated. INU film alone showed poor physical properties. In contrast, the compatibility of INU and CHI demonstrated by the changes in attenuated total reflectance-Fourier transformation infrared spectrum of the INU-CHI film increased tensile strength and elongation at break of the INU film by 8.2- and 3.9-fold, respectively. In addition, water vapor permeability, water solubility, and moisture content of the films decreased proportionally with increasing OT concentration in the INU-CHI film. Incorporation of OT also increased the opacity of a and b values and decreased the L value of the INU-CHI films. All INU-CHI films containing OT exhibited antioxidant and antimicrobial properties. Particularly, the INU-CHI film with 2.0% OT exhibited the highest 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid), 2,2-diphenyl-1-picrylhydrazyl radical scavenging, and antimicrobial activities against four pathogens. Thus, the INU-CHI film containing OT developed in this study might be utilized as an active packaging material in the food industry.

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Section: Resultsmentioning

confidence: 99%

Development of Burdock Root Inulin/Chitosan Blend Films Containing Oregano and Thyme Essential Oils

Cao

Yang

Song

2018

IJMS

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“…Its structure contains lone electron pairs on the amine nitrogen atoms and hydroxyl groups, which can act as chelating sites for heavy metal ions . Previous work has used modified chitosan for the removal of dyes and metal ions from water sources; however, these previous examples suffered from poor processability, which also led to poor reusability . While chitosan possesses the functionality necessary for metal chelation, it is not easily processed into free standing objects on its own.…”

Section: Introductionmentioning

confidence: 99%

A biopolymer‐based 3D printable hydrogel for toxic metal adsorption from water

Appuhamillage

Berry

Benjamin

et al. 2019

Polymer International

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Herein, we describe a 3D printable hydrogel that is capable of removing toxic metal pollutants from aqueous solution. To achieve this, shear‐thinning hydrogels were prepared by blending chitosan with diacrylated Pluronic F‐127 which allows for UV curing after printing. Several hydrogel compositions were tested for their ability to absorb common metal pollutants such as lead, copper, cadmium and mercury, as well as for their printability. These hydrogels displayed excellent metal adsorption with some examples capable of up to 95% metal removal within 30 min. We show that 3D printed hydrogel structures that would be difficult to fabricate by conventional manufacturing methods can adsorb metal ions significantly faster than solid objects, owing to their higher accessible surface areas. © 2019 Society of Chemical Industry

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“…The mode of action of copper-based fungicides is believed to be based on copper(II) ion uptake, followed by interaction with various chemical groups, most prominently sulfhydryl groups, ultimately disrupting the function of enzymes and other proteins [ 55 ], which explains the synergistic action with membrane-permeabilizing chitosans ( Figure 6 ). In our study, the pH value of the medium was around 5.5, where the adsorption capacity of chitosan for copper(II) ions is highest [ 1 , 56 ]. At lower pH values, the cationicity of the protonated amino function prevents copper binding, while at higher pH values, copper(II) ions interact with two amino functions, which lead to complexation and precipitation [ 57 ].…”

Section: Discussionmentioning

confidence: 99%

Synergistic Antimicrobial Activities of Chitosan Mixtures and Chitosan–Copper Combinations

Lemke

Jünemann

Moerschbacher

2022

IJMS

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Several recent studies revealed the significant contribution of intensive agriculture to global climate change and biodiversity decline. However, synthetic pesticides and fertilizers, which are among the main reasons for these negative effects, are required to achieve the high performance of elite crops needed to feed the growing world population. Modern agro-biologics, such as biopesticides, biostimulants, and biofertilizers are intended to replace or reduce the current agro-chemicals, but the former are often difficult to combine with the latter. Chitosans, produced from the fisheries’ byproduct chitin, are among the most promising agro-biologics, and copper fungicides are among the most widely used plant protectants in organic farming. However, the two active ingredients tend to form precipitates, hindering product development. Here, we show that partial hydrolysis of a chitosan polymer can yield a mixture of smaller polymers and oligomers that act synergistically in their antifungal activity. The low molecular weight (Mw) of this hydrolysate allows its combination with copper acetate, again leading to a synergistic effect. Combined, these synergies allow a 50% reduction in copper concentration, while maintaining the antifungal activity. This is potentially a significant step towards a more sustainable agriculture.

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The effect of pH on the bonding of Cu 2+ and chitosan-montmorillonite composite

Cited by 12 publications

References 27 publications

Development of Burdock Root Inulin/Chitosan Blend Films Containing Oregano and Thyme Essential Oils

Development of Burdock Root Inulin/Chitosan Blend Films Containing Oregano and Thyme Essential Oils

A biopolymer‐based 3D printable hydrogel for toxic metal adsorption from water

Synergistic Antimicrobial Activities of Chitosan Mixtures and Chitosan–Copper Combinations

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